Ignition-timing device for magnetos.



D. M. WILSON.

IGNHTION TIMING DEVICE FOR MAGNETOS. APPLIGATIOIE FILED APR. 21, 1911.

i fififi i i Patented May 6, 1913.

2 SHEETS-SHEET 1'.

amuwnto c D. M. WILSON.

IGNITION TIMING DEVICE FOR MAGNETOS.

APPLIGATION FILED APR 21, 1911. I

l,fl60,8'7 l Patented May 6, 1913.

2 SHEETSSHEET 2'.

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TINTTD TAT PATENT @FFTQE.

nnNNrs M. wILsoN, or MUNCIE, INDIANA, AssreNon or O -HALF r0 FREDERICK s. SAUNDERS, or MUNCIE, INDIANA.

IGNITION-TIMING DEVICE FOR MAG-NETOS.

Specification of Letters Patent.

Patenteenia e, ieia.

To all whom it may concern:

Be it known that I, DENNIS M. W'ILsoN, citizen of the United States, residing at Muncie, in the county of Delaware and State of Indiana, have invented certain new and useful Improvements in Ignition-Timing Devices for Magnetos, of which the following is a specification.

This invention relates to an improved means for controlling the variation in' the time of ignition in high tension circuits produced by magnetos employed in conjunction with internal combustion engines. 6

In the present ignition system for internalcombustion engines in which magnetos are employed as an exciter to directly produce the high tension current Without the use of induction coils, and in which thecurrent distributers forma part of the magnetos and are driven directly therewith, the means employed to regulate the variation in the time of ignition comprises the advanc ing or the retarding of the contactbreakers of the magnetos. v

It is a known fact that in magnetos the point of maximum eificiency is obtained by interrupting the magnetic flux, or breaking the contact, when the armature poles lie substantiall in parallelism with the poles of the fiel magnet, and therefore when the cont-act breakers are advanced or retarded the magnetic flux or current is broken'before or after the point of highest efiiciency is reached.

electrodes is considerably lessened. I

It is with the object of overcoming this decrease in the high tension circuit when varying the time of ignition, that this improved ignition timing device is designed.

Another object of'this invention is to provide a coupling member between the engine and the magneto which may be adjusted during the operation of the engine to ad- Vance or retard the armature of the magneto with respect to the cylinders of the engine,

The tension of the current is .thus decreased and the spark between the For a full understanding of the invention and the merits thereof and also to acquire a knowledge of the details of construction, reference is to be had to the following description and accompanying drawings, in which: v Figure 1 is aside elevation of the improved device applied to a magneto; Fig. 2 is a top plan view of the same; Fig. 3 is a longitudinal and central section through the-device detached; Fig-L 4 is a detail per spective view of one end of the coupling, partly in section and showing the parts separated from one another; Fig. 5 is-a detail view of the coupling sleeve and the shifting ring carried thereby; and, Fig. 6

discloses a side elevation of the operating means employed.

Corresponding and like parts are referred to in the following description and indi' cated in all the views of the drawing by the same reference characters.

Referring to the drawings, 10 designates a magneto ofany approved type having a spindle 11v formed with a cone 12 carrying a retaining nut 13.

14 designates a driving shaft which is driven positively by the engine to Wl'llCh the magneto is coupled.

One embodiment of the invention is disclosed in the drawings where 15 and '16 designate a pair ofdriving collars. The-collar 15 has a tapering bore into which is fitted a correspondingly .shaped and relatively soft bushing 17 binding over the cone 12, and being held in such-position by the nut 13. The collar 16 is mounted upon the outer end of the magneto section 18 of a coupling shaft, the col1ars'15 and 16 being held in place by set screws 19 engaging respectively with thecone 12 and the shaft section 18. The collars 15 ,and 16 are formed at their adjacent ends with peripheral flanges 20 having laterally extending and diametrically opposed lugs-21 at their edges engaging in recesses 22 formed at right angles to one another in the opposite edges of a compensating ring 23.

The shaft section 18 is provided with apin 24, formed preferably by reducing the end of the section 18, which engages for rosection 26 of the coupling shaft. The pin 24 centersthe two sections 18 and 26 of the coupling shaft. An outer socket27 is cartation in a socket 25 formed in the driving I vied upon the opposite end ot the driving section 26 receiving the end of the driving shaft 14: which is held therein by a set screw 28.

The shaft sections 18 and 26 are provided with studs 29 and 30, extending in opposite directions, and engaging in oppositely inclined spiral grooves 31 and 32 formed in the inner wall of a coupling sleeve 33, the sleeve being arranged to rotate With the coupling sections. ihe sleeve 33 receives in its opposite ends the shaft sections 18 and 26, and is adapted-for, reciprocation thereover to move the studs 29 and 30 in the in clined grooves 81 and 32 respectively to turn the sections 18 and 26 in opposite directions. The sleeve 33' carries an annular bead 34L midway 0t its ends over which is rotataloly titted a shifting ring 35. The ring 35 is pro vided at one end with aninwardly extending" flange Elli, the marginal edge of which approaches the periphery of the sleeve 38.

ltaceiv'ays 37 are formed in the opposite 't'aces oil the head 34 and in-the inner face of the flange 36 to receive hearing balls 38 adapted to take up the friction incident to the thrustof the sliit'tingring 35 when operated. The balls 38 are held'against the outer side of the head .34: by a gland 89 threaded into, the open end of the ring andhavinp; a raceway 40 which supports other hearing balls 40. The gland 89 is flanged, as at 4-1; the flangecarryin'g set screws 42 binding against the outer face oi? the ring 35 to hold the gland when adjusted. The ring; is provided, at diametrically opposite points, with outstanding studs 4E3, one of Which-is preferably detachable, projecting into elongated openings 4% formed in. the ends of a fork 45. The fork 45 is carried upon a shitting lever 46' fulcruined at 4? upon a suitable support 48, preferably being a projection from the cranlr case of the en 'ne. 7

ny suitable operating means may he employed tor swinging the lever 46, for in stance; as shown in the drawings, a connecting rod 49 is hinged to the outer end ot the lever 46 and is pivoted at its opposite ends to a hand lever 50' mounted upon a suitable support 51. ll segment 52, concentric to the hand lever 50 cooperates with a pawl 53 carried upon the lever 50 to lock the same in adjusted position.

In the use of the improved timingdevice the sleeve 33 is moved into its normal posinooonvi tion, or directly over the meeting ends of the shaft sections 18 and 26. The driving collar 15 is loosened upon the cone 12 and the magneto spindle 11 is adjusted in the usual mannor with respect to the positions of the pie-- tons in the engine, when the collar 15 is again clamped in position to positively drive the magneto trom the engine. The engine is now set in motion, the magneto being adjusted to produce 'its maximum spark.

When it is desired to increase or decrease the speed of the engine, the adjustment of the magneto itself is not altered, out the sleeve 33 is moved over the'shatt sections 18 and 26 in the desired direction, whereupon the studs 29 p and 30 are caused to move through the oppositely inclined grooves 01 and'32 to rotate the shafts in opposite directions with respect to one another. This movement of the sleeve 33alters the adjustment between the magneto spindle andthe pistons of the engine, producing an earlier or a later spark as required without varying the intensity of the spark or decreasing the efticiency of the magneto.

Having thus described the invention, what is claimed is:

in a device of the class described, coacting shatts arranged end to end and each having a stud extending laterally therefrom, a sleeve slidahle over the contiguous portions of said shafts and provided With interior grooves engaging respectively over said studs, said grooves extending" obliquely to the longitudinal plane of the shafts and reversely arranged, an annular rib carried by said sleeve; a collar mounted upon said sleeve and including an annular channel engaging over said rib, means for moving said collar longitudinally of the shafts to cause the sleeve to impart a partial rotation to one of said shafts relative to the other shaft, a clutch member connected to one of said shafts, another clutch member adapted to be coupled to the mechanism to he actuated, and a compensating member located hetwceii the clutch members and including oppositely directed "clutch faces engaging both oi" said clutch members.-

lln testimony Whereot l afia my signature in presence of two Witnesses.

E. F. DAVIE, it. all. Lorre.

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